package com.eos.control.action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Map;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;

import org.apache.struts2.interceptor.SessionAware;

import com.eos.control.action.base.AbstractBaseAction;

public class ValidCodeAction extends AbstractBaseAction implements SessionAware {
	private static final long serialVersionUID = -4062547988201763875L;
	
	private int width;
	private int height;
	private int codeLength;
	private String fontStyle;
	private String randomValue;
	private Map<String, Object> session;
	private ByteArrayInputStream inputStream;

	public void setWidth(int width) {
		this.width = width;
	}

	public void setHeight(int height) {
		this.height = height;
	}

	public void setCodeLength(int codeLength) {
		this.codeLength = codeLength;
	}

	public void setFontStyle(String fontStyle) {
		this.fontStyle = fontStyle;
	}

	public void setRandomValue(String randomValue) {
		this.randomValue = randomValue;
	}

	public void setSession(Map<String, Object> session) {
		this.session = session;
	}

	public void setInputStream(ByteArrayInputStream inputStream) {
		this.inputStream = inputStream;
	}

	public ByteArrayInputStream getInputStream() {
		return inputStream;
	}

	public String execute() throws Exception {
		// 在内存中创建图象
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		// 获取图形上下文
		Graphics g = image.getGraphics();
		// 生成随机类
		Random random = new Random();
		// 设定背景色
		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);
		// 设定字体
		g.setFont(new Font(fontStyle, Font.PLAIN, 30));
		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
		g.setColor(getRandColor(160, 200));
		drawLine(g, random);
		// 取随机产生的认证码
		String rand = randomString(g, random);
		// 将认证码存入缓存
		session.put("code", rand);
		// 图象生效
		g.dispose();
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
		ImageIO.write(image, "JPEG", imageOut);
		imageOut.close();
		setInputStream(new ByteArrayInputStream(output.toByteArray()));
		return SUCCESS;
	}

	private void drawLine(Graphics g, Random random) {
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}
	}

	private String randomString(Graphics g, Random random) {
		StringBuffer sRand = new StringBuffer(0);
		// 取随机产生的认证码
		String rand = "";
		int randomValueLength = randomValue.length();
		for (int i = 0; i < codeLength; i++) {
			rand = String.valueOf(randomValue.charAt(random.nextInt(randomValueLength - 1)));
			sRand.append(rand);
			// 将认证码显示到图象中
			g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
			// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
			g.drawString(rand, 25 * i, 25);
		}
		return sRand.toString();
	}

	/*
	 * 给定范围获得随机颜色
	 */
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}